SD card not working when using Wifi AP. Working fine when connecting to an existing network.

[KobeOne2]

Board

ESP32-S3

Device Description

ESP32-S3-WROOM-1

Hardware Configuration

#define SCK 18
#define MISO 19
#define MOSI 23
#define CS 5

Version

latest master (checkout manually)

IDE Name

Arduino IDE

Operating System

Windows 10

Flash frequency

80 MHz

PSRAM enabled

no

Upload speed

115200

Description

It appears that the SD card only works when not using an access point:

When an access point is created the sd card stops working.

WiFi.softAP("FHD", "123456789");

The SD card functions well as long as no AP is used. Do you have any idea what's going on here?

Sketch

#include <WiFi.h> //Built-in #include <ESP32WebServer.h> //https://github.com/Pedroalbuquerque/ESP32WebServer download and place in your Libraries folder #include <ESPmDNS.h>

#include "CSS.h" //Includes headers of the web and de style file #include <SD.h> #include <SPI.h>

#define SCK 18 //48 #define MISO 19 //36 #define MOSI 23 //35 #define CS 5 //37

ESP32WebServer server(80);

#define servername "FHD33" //Define the name to your server...

bool SD_present = false; //Controls if the SD card is present or not

/********* SETUP **********/

void setup(void) {
Serial.begin(115200);
WiFi.softAP("FHD", "123456789"); //Network and password for the access point genereted by ESP32 ////
 if (!MDNS.begin(servername)) {
Serial.println("Error setting up MDNS responder!"); ESP.restart(); }

Serial.print("Initializing SD card...");

if (!SD.begin(CS)) { 
Serial.println("Card failed or not present, no SD Card data logging possible..."); 
SD_present = false; 
} 
else { 
Serial.println(F("Card initialised... file access enabled...")); 
SD_present = true; 
}

server.begin();

Serial.println("HTTP server started"); }

/********* LOOP **********/

void loop(void) { 
server.handleClient(); //Listen for client connections
}

Debug Message

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0030,len:1344
load:0x40078000,len:13836
load:0x40080400,len:3608
entry 0x400805f0
Initializing SD card...Card failed or not present, no SD Card data logging possible...
HTTP server started

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[lbernstone]

Please try this code. Pin 48 is a bad choice if using a dev board, as that is where the built-in LED is attached.

#include <WiFi.h>
#include <SD.h>

#define SCK  12 //default for S3
#define MISO 13
#define MOSI 11
#define CS   10

void setup(void) {
  Serial.begin(115200);
  WiFi.softAP("FHD", "123456789");
  Serial.print("Initializing SD card...");
  SPI.begin(SCK, MISO, MOSI, CS);
  if (!SD.begin(CS)) {
    Serial.println("SDCard failed");
  } else {
    Serial.println("SDCard initialised");
  }
}

[KobeOne2]

Thanks a lot!

It still does not work. When opening a file right after creating the AP the read fails. Before starting the AP it reads without issue. e.g.:

#include <WiFi.h>
#include <SD.h>

#define SCK  12
#define MISO 13
#define MOSI 11
#define CS   10

const char* ssid = "ESP32-Access-Point";
const char* password = "123456789";

void setup(void) {
  Serial.begin(115200);
  
  Serial.print("Initializing SD card...");
  SPI.begin(SCK, MISO, MOSI, CS);
  if (!SD.begin(CS)) {
    Serial.println("SDCard failed");
  } else {
    Serial.println("SDCard initialised");
  }
  
  File file2 = SD.open("/index.html", FILE_READ);
  if (file2) {
    Serial.println("Success");
    file2.close();
  }
  else{
    Serial.println("Fail");
  }

  WiFi.softAP(ssid, password);
  Serial.println("AP started");
  
  File file3 = SD.open("/index.html", FILE_READ);
  if (file3) {
    Serial.println("Success");
    file3.close();
  }
  else{
    Serial.println("Fail");
  }
}

This prints for me when running:

Initializing SD card...
SDCard initialised
Success
AP started
Fail

[lbernstone]

I'm unable to reproduce
Put a delay(100) in after you start the AP. Turn core debugging level to verbose and see if you get more info in the console.
It's possible this is a power issue, but that's a pretty strange result, if so.

[everslick]

If I had to guess, I'd also say power supply.

[VojtechBartoska]

@P-R-O-C-H-Y Please help with triage, thanks